For those shopping for a NEW vehicle in almost every major worldwide market, the SFA is not sufficient to sell vehicles any longer. The ride and handling improvments of IFS are huge compared to the old designs.
Imagine the typical NEW SUV buyer shopping dealers in, ohhh, Los Angeles for example.
Escalade = Nice, powerful, roomy
Navigator = Nice, powerful, roomy
Land Cruiser (if it has the 100's V8 but the 80's suspension/frame) = Nice, roomy, ride and handling sucks. Doesn't equal the Caddy or Lincoln.
Who will get the sale? Not Toyota often. Demand and laws drive designs. SFA is dead except for limited certain applications where a NEW buyer will demand it (HD Pickup, Wrangler buyer...you notice other Jeep models are IFS).
The makers don't build NEW vehicles for folks like us (wheelers who want to four-wheel them and pick them up used for cheap). Remember, at one point it was reported the URJ200 might be IRS. Then later we heard the LX570 would by IRS...different from the Toyota version due to an even more demanding buyer. SFA is gone like the carburetor.